Customers often complain about long waiting times at restaurants before

Customers often complain about long waiting times at restaurants before

Customers often complain about long waiting times at restaurants before the food is served. A restaurant claims that it serves food to its customers, on average, within 15 minutes after the order is placed. A local newspaper journalist wanted to check if the restaurant’s claim is true. A sample of 36 customers showed that the mean time taken to serve food to them was 15.75 minutes with a standard deviation of 2.4 minutes. Using the sample mean, the journalist says that the restaurant’s claim is false. Do you think the journalist’s conclusion is fair to the restaurant? Use a 1% significance level to answer this question